Malicious PDF — malware analysis report

Static analysis result for SHA-256 c060727170dd6b6e…

MALICIOUS

PDF

71.8 KB Created: 2021-09-25 01:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a4da79f35bbd68895d874870b31bfb90 SHA-1: 2190c2a01838241d7e4812b93ea6bc746ab78279 SHA-256: c060727170dd6b6e790a67042b74a9fbed46687838314e67c0f515ca90c11e1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://targhevaticane.it/userfiles/files/rusimevofanuzewewukelamo.pdf In PDF document text
    • http://studiofapas.it/userfiles/files/votiwusapepesegubuzesuw.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/37899920099.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/mepalupevanodomedudux.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/diwibewoxuteze.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/piledibuwumevut.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/gezogofal.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/mebugoxoxokefivomogiso.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/8609949147.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/nakekir.pdfIn PDF document text
    • http://hflchw.com/upload/file/womavemesimajekawok.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/d44e8499b1e38b0f82c69013f341412e.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/turetanapasuwip.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/15944842857.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/40671548563.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/28829920745.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/12196364423.pdfIn PDF document text
    • http://bourgogne.annuaire-regional.com/ckfinder/userfiles/files/60784125729.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614c2901b378d---xukizifijovaradopipir.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/82856681428.pdfIn PDF document text
    • https://grnca.org/img/files/files/5840213041.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/kafavezapowigugidirudurud.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210915_091900.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/65726456593.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/13900752051.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/pilikawigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=wrestling+revolution+old+version+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB510 17376 bytes
SHA-256: 09023786831ee0ca3cf7874f415c3a2a04e3c14271a3666b2f88119197f3a771
font_01_sfnt_off0000e06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06B 10668 bytes
SHA-256: fca82bf720da0e39686af8d7ae6a11f835bd362f42c301b2d78a2c9ccdc2250f
font_02_sfnt_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1